Long-Term Stable Perovskite Solar Cells Neutralizing Corrosive Halide Ionic Defects
Hyungcheol Back a, Geunjin Kim a, Heejoo Kim a, Kwanghee Lee a
a RISE and HCAM,GIST, 123 Cheomdangwagi-ro, Buk-gu, Gwangju , 61005, Korea, Republic of
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Poster, Hyungcheol Back, 027
Publication date: 7th November 2016

Despite remarkable rise in efficiencies of hybrid organic-inorganic perovskite solar cells (PSCs), instability issues from intrinsic defects in perovskite layers have been main obstacle to the next generation power sources. Since this instability imposes to use expensive noble metal electrodes such as gold and platinum, which leads a dilemma between low-cost processability and long-term stability of the PSCs, low cost PSCs with long term stability would have major impact on the needs of our society. In this work, we clearly reveal that a critical self-degradation process of the PSCs arises from intrinsic ionic defects of the perovskite layer and successfully solve the problem with a new regime for long-term stable PSCs, which is versatile and universal method of using a “solution-processable chemical inhibition layer (CIL)” by neutralizing the ionic defects and inhibiting the corrosion of common metal electrodes. As a consequence, our long-term stable PSCs maintains almost ~ 80% of their initial PCEs even after the 9,000-storage hours under nitrogen condition, and ~ 80% after 200 hours even in ambient condition without any encapsulation. More importantly, we verified the universality of CIL whose amine function groups and metal oxide network medium act as “a corrosion inhibitor and a charge transport layer”, respectively. Our CIL, a solution-processable amine-mediated titanium suboxide (A-TiOx), successfully stabilizes iodide ions and protects the common metal electrodes of Al and Ag as an “active” passivation layer in the PSCs.

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